Mounted printing-plate



Patented July 26, 1921.

Fm I.

Q\RECT\ON OF GRR\N Fla 2 INVENTOR HQRACEW. HACKER 4 ATTORNEY.

PATENT OFFICE.

HORACE W. HACKER, OF CHICAGO, ILLINOIS.

noun'rnn PRINTING-PLATE.

Specification of Letters Patent.

. Patented July 26, 1921.

Application filed December 30, 1920. Serial No. 434,078.

To all whom it more concern:

Be it known that I, Home W. HnoKEn, a citizen of the United States, residmg at Chicago, in the county of Cook and State of Illinois have invented a certain new and usefullmprovement in Mounted Printing- Plates, of which the following 1s a full, clear, concise, and exact descriptlon.

My inventlon relates to printing plates, such as electrotypes for example, and has for its object the provision of an improved form of wooden mounting for the plates which will not warp and which may readily be brought to such a thickness that it and the plate supported thereon will together be type high.

11 carrying out my invention the wooden block that constitutes the mounting for the printing plate has its grain extending along the plate so as to be somewhat parallel therewith. This grain, throughout a portion of the thickness of the block, is severed at intervals to prevent the block from being warped. In the preferred embodiment of the invention the wooden mounting block has holes bored therein crosswise of the grain and extending between the plate supporting face of the block and the bottom of the block. These holes desirably extend clear through the block, although I do not wish to lim1t myself to this characteristic.

In accordance with another feature of my invention the plate is brought into assembly with the block by means of a layer of suitable sheet material, such as paper, which has its top surface glued-to the bottom of the plate and its bottom surface glued to the top of the block. The paper is preferably first applied to the bottom of the plate, whereafter it is applied to the top of the block, and when the plate is thus assembled with the block the grain severing holes desirably extend clear through to the top surface of the block so that any excess of adhesive material which is employed to assemble .the paper with the block may exude into these holes.

I will explain my invention more fully by reference to the accompanying drawing showing the preferred embodiment-thereof and in which Figure 1 is a plan view of'a wooden block with holes bored through the same in accordance with my invention; Fig. 2 is an elevation of the block shown in Fig. 1 in combination with the plate mounted thereon; and Fig. 3 is a sectional view on line 3-3 of Fig. 1

- Like parts are indicated by similar characters of reference throughout the different figures.

The mounting block 1 is made of wood, the grain .of which runs substantially parallel with the plane of the plate that is to be supported upon the block. Holes 2 are bored into the block angularly to the plate that is supported by the block. these holes preferably extending from one side of the block clear to the other side. These holes are so distributed throughout the block that enou h of the grain of the wood is sulficient y severed at intervals to prevent the block from warping.

In the preferred embodiment of the invention the plate 3 that is to be mounted upon the'block has applied to its bottom face a sheet of paper or other suitable sheet material 4, glue bein preferably applied to cause the paper to a here to the plate. The paper and the adhesive employed to assemble it with the plate are preferably permitted to become dry before the plate is assembled with the wooden mounting block. The bottom surface of the paper or the top face of the block, or both thebottom face of the paper and the top face of the block, are coated with glue or other suitable adhesive material, whereafter the plate is pressed upon the block 'to cause the paper and plate firmly to adhere to the block. Inasmuch as the paper is not accessible after it has been placed upon the block with the plate, the openings 2 are extended clear through to the top face of the block in order that excessive adhesive material may not be trapped between the paper and the block but will find passage to said openings, whereby the working aggregate height of the plate and block is not modified by the adhesive material. The printin plate 3 and the sheet of .paper 4 applied t ereto together constitute a printin plate element, but I do not wish the precise details of construction shown as changes may readily be made without dearting from the s irit of my invention, but liaving thus described 'my invention I claim as new and desire to secure by Letters Patent the following: t v

1. The combination with a printing plate; of a wooden mounting block for the printing plate having its grain extending along the plane of the plate'and formed with holes distributed throughout the block and extending from the late supporting face of the block toward t e opposite face of the block to cut the grain of the block; and a layer of sheet material assembled with the adjacent faces of the plate and block b an adhesive, said holes receiving surplus ad esive flowing from between the sheet material and block.

2. The combination with a rinting plate element; of a wooden mountmg block for the printing plate element that is assembled with the block by an adhesive, said block having its grain extending along the plane of the printing plate element and formed with holes distributed throu hout the block and extending from the ate supporting face of the block toward t e opposite face of the block to cut the grain of the block, said holes receiving surplus adhesive flowing from between the printing plate element" and block.

3. The combination with a printing plate; of a wooden mounting block for and assembled with the printing plate, said block being formed with holes distributed throughout the block and directed to cross and sever the grain thereof.

4. The combination with a printin plate; of a wooden mounting block for an assembled with the printing plate, said block being formed with holes angular to the printing plate to sever the grain of the block at intervals.

In witness whereof, I hereunto subscribe my name this twenty-first day of December A. D., 1920.

HORACE W. HACKER. 

